JP2016035543A - Imaging device and method for correcting image blur using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely correct image blur caused by change in attitude of the rolling direction of an imaging device even when the optical center of an optical system and the rotational center of an imaging element are not the same.SOLUTION: The imaging device includes: an optical system forming an image of an object; an imaging element photoelectrically converting the image; a driving unit carrying out translation movement and rotational movement of the imaging element or carrying out translation movement of an image blur correction lens in the optical system and rotational movement of the imaging element; a first angular velocity detector detecting a rotational angular velocity around an optical axis of the optical system; and an image blur correction controller controlling the driving unit to correct imaging blur on the basis of the rotational angular velocity detected by the first angular velocity detector, the optical center position of the optical system, and the rotational center position of the imaging element.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image pickup apparatus having a function of correcting image blur caused by camera shake and the like, and an image blur correction method thereof.

  2. Description of the Related Art Conventionally, as a camera shake correction function of a camera, a camera shake correction function that corrects an image shake (angle shake) caused by a posture change in the yaw direction and the pitch direction of the camera due to a camera shake is known. In recent years, image stabilization (translation) that occurs as a result of camera movement in the vertical (vertical) and horizontal (horizontal) directions due to camera shake has been advanced, as camera shake correction functions have become more sophisticated. There is also a camera shake correction function for correcting camera shake and a camera shake correction function for correcting image shake (rotation shake) caused by a posture change in the roll direction of the camera due to camera shake. In addition, cameras that can correct any type of image blur by combining these camera shake correction functions are also available.

  In particular, the camera shake correction function that corrects the above-described rotational shake can exert an image shake correction effect when a photographer holds the camera by hand and performs long-second exposure shooting (shooting with a long exposure time). Are known.

  As a camera equipped with a camera shake correction function, for example, the camera described in Patent Document 1 is known. This camera includes an XY actuator that moves the CCD image sensor in the horizontal direction and the vertical direction, and a rotary actuator that rotates the XY actuator, and drives the XY actuator based on the outputs of the pitch sensor and the yaw sensor. Image blurring is corrected by driving the rotary actuator based on the output of the tilt sensor.

JP-A-9-261524

  When a rotational movement about the optical axis direction of the optical system of the camera occurs in the camera (even if the camera changes its orientation in the roll direction), the subject image formed on the image sensor of the camera Rotates around the optical center of the optical system. The optical center of the optical system is also the optical axis center of the optical system.

  On the other hand, the camera shake correction function that corrects the image blur caused by the posture change in the roll direction of the camera rotates the image sensor around the center of the imaging surface of the image sensor that captures the subject image formed by the optical system. By doing so, the image blur is corrected.

  In general, a camera is configured such that the optical center of an optical system coincides with the center of an imaging surface of an imaging device. However, in practice, the two do not always match due to camera design and manufacturing restrictions (for example, accuracy).

  In addition, by moving the correction lens included in the optical system in translation and shifting the optical axis direction of the optical system, image blur caused by posture changes in the yaw direction and pitch direction of the camera and the vertical and horizontal directions of the camera There is a camera shake correction function that corrects image blur caused by translation. In such a camera shake correction function, when the optical axis direction of the optical system is shifted due to the translational movement of the correction lens, the optical center of the optical system does not coincide with the center of the imaging surface of the imaging device. Similarly, in the camera shake correction function in which such image blur is corrected by the translational movement of the image sensor, the optical center of the optical system and the center of the imaging surface of the image sensor are caused by the translational movement of the image sensor. It will not match.

  As described above, when the image blur caused by the posture change in the roll direction of the camera is corrected when the optical center of the optical system and the imaging surface center of the image sensor do not coincide with each other, The image blur direction cannot be canceled by the calculated image blur correction amount and the image blur correction direction. This is because the calculated image blur correction amount and the image blur correction direction are obtained on the assumption that the optical center of the optical system and the center of the imaging surface of the imaging device coincide with each other.

As a result, in the obtained captured image, the image blur may not be completely corrected, or the image blur may be partially amplified.
Note that image blur caused by the posture change in the roll direction of the camera when the optical center of the optical system and the imaging surface center of the image sensor coincide with each other gradually from the periphery of the captured image toward the center. Since the image becomes smaller, there are many cases where image blur is not conspicuous in the entire photographed image. However, as described above, if shooting is performed together with image blur correction in a state where the optical center of the optical system and the imaging surface center of the image sensor do not coincide with each other, image blurring occurs at the center of the captured image. In some cases, the image quality of the captured image may be deteriorated.

The above-mentioned Patent Document 1 has no disclosure for such a problem.
In light of the above situation, the present invention prevents image blur caused by the posture change in the roll direction of the imaging device even when the optical center of the optical system and the rotation center of the imaging device do not coincide. An object of the present invention is to provide an imaging apparatus capable of correcting with high accuracy and an image blur correcting method thereof.

  According to a first aspect of the present invention, there is provided an optical system that forms a subject image, an image sensor that photoelectrically converts the subject image formed by the optical system, and translational and rotational movement of the image sensor, or A drive unit that performs translational movement of an image blur correction lens included in the optical system and rotational movement of the imaging device; and a first angular velocity detection that detects a rotational angular velocity with the optical axis direction of the optical system as a rotational axis. The drive unit so that image blur is corrected based on the rotation angular velocity detected by the first angular velocity detection unit, the optical center position of the optical system, and the rotation center position of the image sensor. An image blur correction control unit that controls the image pickup apparatus is provided.

  According to a second aspect of the present invention, in the first aspect, the image blur correction control unit calculates the image blur correction amount based on the rotational angular velocity detected by the first angular velocity detection unit. A calculation unit, a positional shift amount calculation unit that calculates a positional shift amount between the optical center position of the optical system and the rotation center position of the image sensor, and an image blur correction amount calculated by the image blur correction amount calculation unit. Based on the positional deviation amount calculated by the positional deviation amount calculation unit, the positional deviation compensation amount in the first direction orthogonal to the optical axis direction of the optical system and orthogonal to the first direction A positional deviation compensation amount calculating unit that calculates a positional deviation compensation amount in the second direction, and the image blur correction control unit includes the image blur correction amount calculated by the image blur correction amount calculating unit, and The first value calculated by the positional deviation compensation amount calculation unit. Based on the position deviation compensation amount and position deviation compensation amount of the second direction direction, and controls the driving unit so that the image blur is corrected, to provide an imaging apparatus.

  According to a third aspect of the present invention, in the first aspect, the second angular velocity detection unit that detects a rotational angular velocity having a first direction orthogonal to the optical axis direction of the optical system as a rotation axis; A third angular velocity detection unit that detects a rotational angular velocity with a second direction orthogonal to the first direction as a rotation axis, and the image blur correction control unit includes the first angular velocity detection unit. A first image blur correction amount calculating unit that calculates a first image blur correction amount based on the rotation angular velocity detected by the step, a rotation angular velocity detected by the second angular velocity detection unit, and a focal length of the optical system. The second image blur correction amount is calculated based on the second angular velocity, and the third image blur correction amount is calculated based on the rotational angular velocity detected by the third angular velocity detection unit and the focal length of the optical system. 2 image blur correction amount calculation unit and the rotation center position of the image sensor Position between the position moved by the second image blur correction amount and the third image blur correction amount calculated by the second image blur correction amount calculation unit and the optical center position of the optical system A positional shift amount calculation unit that calculates a shift amount, a first image blur correction amount calculated by the first image blur correction amount calculation unit, and a positional shift amount calculated by the positional shift amount calculation unit. And a position shift compensation amount calculation unit that calculates a position shift compensation amount in the first direction and a position shift compensation amount in the second direction, and the image blur correction control unit includes the first shift correction unit. The first image blur correction amount calculated by the image blur correction amount calculation unit, the second image blur correction amount and the third image blur correction amount calculated by the second image blur correction amount calculation unit. And the position in the first direction calculated by the positional deviation compensation amount calculation unit. Based on the record compensation amount and position deviation compensation amount of the second direction, and controls the driving unit so that the image blur is corrected, to provide an imaging apparatus.

  According to a fourth aspect of the present invention, there is provided an optical system that forms a subject image, an image sensor that photoelectrically converts the subject image formed by the optical system, and translational and rotational movement of the image sensor, or A drive unit that performs translational movement of an image blur correction lens included in the optical system and rotational movement of the imaging device; and a first angular velocity detection that detects a rotational angular velocity with the optical axis direction of the optical system as a rotational axis. An image blur correction method for an image pickup apparatus comprising: a rotation angular velocity detected by the first angular velocity detection unit; an optical center position of the optical system; and a rotation center position of the image sensor. Provided is an image blur correction method for controlling the driving unit so that image blur is corrected.

  According to a fifth aspect of the present invention, in the fourth aspect, the image blur correction method calculates an image blur correction amount based on a rotational angular velocity detected by the first angular velocity detector, and the optical system includes: A positional deviation amount between the optical center position and the rotation center position of the imaging element is calculated, and based on the calculated image blur correction amount and the calculated positional deviation amount, the optical axis direction of the optical system is calculated. A positional deviation compensation amount in a first direction that is orthogonal and a positional deviation compensation amount in a second direction orthogonal to the first direction are calculated, and the calculated image blur correction amount and the calculated first An image blur correction method is provided that controls the drive unit so that an image blur is corrected based on a position shift compensation amount in the first direction and a position shift compensation amount in the second direction.

  According to a sixth aspect of the present invention, in the fourth aspect, the imaging device is a second angular velocity that detects a rotational angular velocity having a first direction orthogonal to the optical axis direction of the optical system as a rotation axis. A detection unit; and a third angular velocity detection unit that detects a rotational angular velocity with a second direction orthogonal to the first direction as a rotation axis. The image blur correction method includes: The first image blur correction amount is calculated based on the rotational angular velocity detected by the angular velocity detecting unit, and the second image blur correction amount is calculated based on the rotational angular velocity detected by the second angular velocity detecting unit and the focal length of the optical system. The image blur correction amount is calculated, the third image blur correction amount is calculated based on the rotational angular velocity detected by the third angular velocity detection unit and the focal length of the optical system, and the rotation center position of the imaging device is calculated. , The calculated second image blur correction amount and the calculated 3 to calculate a positional shift amount between the position moved by the image blur correction amount of 3 and the optical center position of the optical system, and the calculated first image blur correction amount and the calculated positional shift amount. Based on the calculated first image blur correction amount and the calculated second image blur correction amount, and the calculated first image blur correction amount and the calculated second image blur correction amount. Image blur is corrected based on the correction amount and the third image blur correction amount, and the calculated positional deviation compensation amount in the first direction and the calculated positional deviation compensation amount in the second direction. Provided is an image blur correction method for controlling the driving unit.

  According to the present invention, even when the optical center of the optical system and the rotation center of the image sensor do not coincide with each other, it is possible to accurately correct image blur caused by the posture change in the roll direction of the imaging device. Can do.

It is a figure explaining the definition of a direction. It is a 1st figure explaining the outline | summary of the rotation blurring correction | amendment (correction | amendment of the image blurring accompanying the attitude | position change of the roll direction of a camera) which the camera which concerns on each embodiment performs. It is a 2nd figure explaining the outline | summary of the rotational blurring correction | amendment (correction | amendment of the image blurring accompanying the attitude | position change of the roll direction of a camera) which the camera which concerns on each embodiment performs. It is a figure which shows the structural example of the camera which concerns on 1st Embodiment. It is a figure which shows typically the structural example of the image pick-up element drive part which concerns on 1st Embodiment. It is a figure which shows the example of an internal structure of the blurring correction | amendment microcomputer which concerns on 1st Embodiment. It is a figure which shows the internal structural example of the Roll correction amount calculation part which concerns on 1st Embodiment. 6 is a flowchart illustrating an example of an image blur correction operation of the camera according to the first embodiment. It is a figure which shows the structural example of the camera which concerns on 2nd Embodiment. It is a figure which shows the example of an internal structure of the blurring correction | amendment microcomputer which concerns on 2nd Embodiment. It is a figure which shows the internal structural example of LCU which concerns on 2nd Embodiment. It is a figure which shows the structural example of the Yaw displacement amount calculation part based on 2nd Embodiment, a Pitch displacement amount calculation part, and a Yaw / Pitch correction amount calculation part. It is a flowchart which shows an example of the image blur correction operation | movement of the camera which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, prior to the description of the camera according to each embodiment, a direction used for the description is defined, and an outline of rotational blur correction performed by the camera is described.

FIG. 1 is a diagram for explaining the definition of a direction.
As shown in FIG. 1, a camera 1 according to each embodiment to be described later has a configuration in which an interchangeable lens 2 is attached to a camera body 3. In such a camera 1, the X direction, the Y direction, the Z direction, the pitch direction, the yaw direction, and the roll direction are defined as follows.

  The left-right direction (horizontal direction) of the camera body 3 is defined as the X direction. Further, in the X direction, the right direction when viewing the front of the camera body 3 is defined as + direction, and the left direction is defined as − direction. Note that the X direction also corresponds to the left-right direction of an imaging surface of an imaging device described later.

  The vertical direction of the camera body 3 is the Y direction. In the Y direction, the upper direction is the + direction and the lower direction is the-direction. Note that the Y direction also corresponds to the up and down direction of the imaging surface of the imaging element described later.

  The optical axis direction of the optical system included in the interchangeable lens 2 is defined as the Z direction. In the Z direction, the direction from the camera body side to the interchangeable lens side is defined as a positive direction, and the direction from the interchangeable lens side to the camera body side is defined as a negative direction.

The rotation direction with the X direction as the rotation axis is defined as the pitch direction. In the pitch direction, the left rotation toward the + X direction is defined as the + direction, and the right rotation toward the + X direction is defined as the − direction.
A rotation direction with the Y direction as a rotation axis is a yaw direction. In the yaw direction, a right rotation toward the + Y direction is defined as a + direction, and a left rotation toward the + Y direction is defined as a − direction.

The rotation direction with the Z direction as the rotation axis is the roll direction. Further, in the roll direction, the left rotation toward the + Z direction is defined as the + direction, and the right rotation toward the + Z direction is defined as the − direction.
In addition, since the positive / negative (+,-) of the direction defined in this way is dependent on the mounting direction of the angular velocity sensor mentioned later, of course, it is not limited to the above.

2 and 3 are diagrams illustrating an outline of rotational blur correction (correction of image blur caused by a change in posture of the camera 1 in the roll direction) performed by the camera 1 according to each embodiment.
FIG. 2 shows an image formed on the imaging surface when the posture change in the roll direction of the camera 1 occurs when the optical center of the optical system of the camera 1 coincides with the imaging surface center of the imaging element of the camera 1. An example of movement of each point of a subject image is shown. In FIG. 2, points a, b, b1, c, and c1 are points on the imaging surface, and point a is also a point located at the optical center and the center of the imaging surface.

  In this case, since the point of the subject image located at the point a is also a point located at the optical center, it does not move even if the posture change (θroll) in the roll direction of the camera 1 occurs. On the other hand, when the posture change (θroll) in the roll direction of the camera 1 occurs, the points of the subject image located at the points b and c rotate around the optical center (point a) to the points b1 and c1. Moving.

  Therefore, when the posture change (θ roll) in the roll direction of the camera 1 occurs when the optical center and the imaging surface center coincide with each other, the imaging element is reversed with the imaging surface center (point a) as the rotation center. Rotational blur correction can be performed by rotational movement (−θroll).

  FIG. 3 shows an image formed on the imaging surface when the posture change in the roll direction of the camera 1 occurs when the optical center of the optical system of the camera 1 and the imaging surface center of the imaging device of the camera 1 do not match. An example of movement of each point of a subject image is shown. In FIG. 3, it is assumed that points a, a1, a2, b, b1, c, c1, and c2 are points on the imaging surface, and point a is also a point located at the center of the imaging surface. The point is also a point located at the optical center.

  In this case, since the point of the subject image located at the point b is located at the optical center, it does not move even if the posture change (θroll) in the roll direction of the camera 1 occurs. On the other hand, when the posture change (θroll) in the roll direction of the camera 1 occurs, the points of the subject image located at the points a and c rotate about the optical center (point b) as the center of rotation, and become points a1 and c1. Moving.

  In this case, if rotational blur correction is performed in the same manner as in the example shown in FIG. 2, the points of the subject image located at points a1, b, and c1 rotate the center of the imaging surface (point a). The imaging element rotates in the reverse direction (-θroll) as the center, and moves to points a2, b1, and c2.

  Here, the magnitude of the vector aa1 having the start point as a and the end point as a1 is represented as Bra, the size of the vector cc1 having the start point as c point and the end point as c1 is represented as Brc. The size of the vector a1a2 having the start point a1 and the end point a2 is Sra, the size of the vector bb1 having the start point b and the end point b1 is Srb, the start point c1 and the end point c2 Let Src be the size of the vector c1c2 that is a point. The vector aa2 (the sum of the vector aa1 and the vector a1a2) having the start point a and the end point a2 is Bofsa, the vector cc2 having the start point c and the end point c2 (vector cc1 and vector c1c2) ) Is defined as Bofsc. In this case, the magnitude Srb of the vector bb1 is equal to the magnitude Bofsa of the vector aa2 and the magnitude Bofsc of the vector cc2. Further, the direction of the vector bb1 is equal to the direction of the vector aa2 and the direction of the vector cc2. That is, the vector bb1 is equal to each of the vector aa2 and the vector cc2.

  Accordingly, when the posture change (θroll) in the roll direction of the camera 1 occurs when the optical center and the imaging surface center do not coincide with each other, the rotational blur correction (see FIG. 2) is performed. Temporary rotational blur correction) is performed, and a positional shift (vector bb1 = vector aa2 =) caused by a mismatch between the optical center and the center of the imaging surface caused by the rotational movement (−θroll) of the image sensor at that time. By rotating the subject image relative to the imaging surface in a direction that cancels the vector cc2), it is possible to perform rotational blur correction as a whole.

Based on the above, details of the camera 1 according to each embodiment will be described below.
<First Embodiment>
The camera 1 according to the first embodiment is a camera having a function of correcting image blur caused by a change in posture of the camera 1 in the roll direction.

FIG. 4 is a diagram illustrating a configuration example of the camera 1 according to the present embodiment.
As shown in FIG. 4, the camera 1 according to the present embodiment has a configuration in which the interchangeable lens 2 is attached to the camera body 3. The camera body 3 is configured so that the interchangeable lens 2 is detachable, and the interchangeable lens 2 is attached to the camera body 3 by a lens mount connection portion (not shown) provided in the interchangeable lens 2 and the camera body 3. This is performed by fitting each other with a body mount connecting portion (not shown) provided. As a result, the interchangeable lens 2 is fixed to the camera body 3, and terminals provided at each mount connection portion are also electrically connected, and the interchangeable lens 2, the camera body 3, and the like are connected via the contact points 4. Communication between the two becomes possible.

The interchangeable lens 2 includes an optical system 21, an LCU (lens control unit) 22, and an optical system driving unit 23.
The optical system 21 forms a light beam from the subject on the imaging surface of the imaging element 32 as a subject image. The optical system 21 includes a lens group for adjusting the focal position (hereinafter referred to as “focus lens”) and a lens group for adjusting the focal length (hereinafter referred to as “zoom lens”).

  The optical system drive unit 23 moves a focus lens and a zoom lens included in the optical system 21 in the optical axis direction under the control of the LCU 22. Thereby, focal position adjustment (hereinafter referred to as “focusing”) and focal length adjustment (hereinafter referred to as “zooming”) are performed.

  The LCU 22 communicates with the system controller 34 via the contact 4 and controls the overall operation of the interchangeable lens 2. For example, the LCU 22 controls focusing and zooming by controlling the optical system driving unit 23 in cooperation with the system controller 34. For example, the LCU 22 monitors the position of the optical system 21, obtains the optical center position of the optical system 21 from the position of the optical system 21, and transmits the optical center position to the system controller 34 via the contact 4. .

  The optical center of the optical system 21 is adjusted at the stage of design and manufacture so as to coincide with the center of the image pickup surface of the image pickup device 32. , They do not necessarily match. Therefore, the LCU 22 obtains the optical center position of the optical system 21 from the position of the optical system 21. As a method of obtaining the optical center position at this time, for example, in the design or manufacturing stage, the optical center position at each position of the optical system 21 is measured in advance, and the relationship between the two is represented as an approximate expression or table as an LCU 22. There is a method of obtaining the optical center position from the position of the optical system 21 based on the approximate expression or table.

In addition, the LCU 22 also performs control of a diaphragm (not shown), for example.
The camera body 3 includes a focal plane shutter (hereinafter simply referred to as “shutter”) 31, an image sensor 32, an image sensor drive unit 33, a system controller 34, a shake correction microcomputer 35, a Roll angular velocity sensor 36, and an SW (switch) unit 37. Including.

The shutter 31 is disposed in front of the image sensor 32, and opens and closes the imaging surface of the image sensor 32 by performing an opening / closing operation under the control of the system controller 34.
The image pickup device 32 is an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), for example, and converts the subject image formed on the image pickup surface into an electric signal under the control of the system controller 34. Convert (photoelectric conversion). The converted electrical signal is read out as a video signal by the system controller 34.

  The image sensor drive unit 33 is configured to support the image sensor 32, translates the image sensor 32 in the X direction and the Y direction, and controls the center of the image plane of the image sensor 32 under the control of the blur correction microcomputer 35. The image sensor 32 is rotated about the rotation center. Details of the image sensor driving unit 33 will be described later with reference to FIG.

  The system controller 34 communicates with the LCU 22 through the contact 4 and communicates with the shake correction microcomputer 35 and controls the overall operation of the camera body 3 and the camera 1. For example, the system controller 34 controls focusing and zooming in cooperation with the LCU 22. For example, the system controller 34 controls the shutter 31 and the image sensor 32. Further, for example, the system controller 34 reads a video signal from the image sensor 32 and converts it into image data of a predetermined format. For example, the system controller 34 receives the optical center position of the optical system 21 transmitted from the LCU 22 and transmits it to the shake correction microcomputer 35. Further, for example, the system controller 34 transmits a shake correction start / end instruction signal to the shake correction microcomputer 35. Further, for example, the system controller 34 receives the instruction signal transmitted from the SW unit 37 and performs processing according to the instruction signal (for example, imaging processing according to the imaging instruction signal).

  The shake correction microcomputer 35 receives a start / end instruction signal for shake correction from the system controller 34. Further, the shake correction microcomputer 35 is based on the output of the Roll angular velocity sensor 36, the optical center position of the optical system 21 transmitted from the system controller 34, and the rotation center position (also the image pickup surface center position) of the image sensor 32. Then, the image sensor driving unit 33 is controlled so as to move the image sensor 32 in the direction to cancel the image blur. Details of the blur correction microcomputer 35 will be described later with reference to FIG.

The Roll angular velocity sensor 36 detects the rotational angular velocity in the roll direction.
The SW unit 37 is an operation unit for receiving various instructions from the user, and transmits an instruction signal corresponding to the instruction received from the user (for example, a shooting instruction signal corresponding to the shooting instruction) to the system controller 34.

FIG. 5 is a diagram schematically illustrating a configuration example of the image sensor driving unit 33.
As illustrated in FIG. 5, the image sensor driving unit 33 includes an X1 driving unit 331, an X2 driving unit 332, and a Y driving unit 333.

  The X1 driving unit 331 and the X2 driving unit 332 work together to move the image sensor 32 in the X direction and rotate it. For example, when the image sensor 32 is moved in the X direction, the same drive amount with the same sign is given as the drive amount of the X1 drive unit 331 and the X2 drive unit 332. On the other hand, when the image pickup device 32 is rotated, the same drive amount with different signs is given as the drive amounts of the X1 drive unit 331 and the X2 drive unit 332.

The Y drive unit 333 moves the image sensor 32 in the Y direction.
FIG. 6 is a diagram illustrating an internal configuration example of the shake correction microcomputer 35.
As shown in FIG. 6, the shake correction microcomputer 35 includes an ADC (Analog-to-digital converter) 351, a communication unit 352, a correction amount calculation unit 353, and a motor driver 354.

The ADC 351 sequentially converts an analog signal that is an output signal of the Roll angular velocity sensor 36 into a digital signal at a predetermined sampling rate, and outputs the digital signal.
The communication unit 352 communicates with the system controller 34. For example, the communication unit 352 receives a start / end instruction signal for shake correction transmitted from the system controller 34. For example, the communication unit 352 receives the optical center position of the optical system 21 transmitted from the system controller 34.

  The correction amount calculation unit 353 performs image blurring based on the output of the ADC 351, the optical center position of the optical system 21 received by the communication unit 352, and the rotation center position (also the center position of the imaging surface) of the imaging element 32. The target drive position (X1, X2, Y) of the image sensor drive unit 33 for moving the image sensor 32 in the direction to cancel is calculated. X1 is a target drive position of the X1 drive unit 331, X2 is a target drive position of the X2 drive unit 332, and Y is a target drive position of the Y drive unit 333.

  More specifically, the correction amount calculation unit 353 includes a Roll correction amount calculation unit 3531, a corrected rotation center error calculation unit 3532, a correction rotation center error compensation amount calculation unit 3533, and a target drive position calculation unit 3534. Perform the following process.

  The Roll correction amount calculation unit 3531 calculates the angular displacement amount in the roll direction from the start of blur correction based on the output of the ADC 351, and outputs the angular displacement amount as the rotational blur correction amount (θ) in the roll direction. Details of the Roll correction amount calculation unit 3531 will be described later with reference to FIG.

The corrected rotation center error calculation unit 3532 calculates a positional deviation amount (corrected rotation center error) between the optical center position of the optical system 21 received by the communication unit 352 and the rotation center position of the image sensor 32.
The correction rotation center error compensation amount calculation unit 3533 corrects rotation based on the calculation result (correction rotation center error) of the correction rotation center error calculation unit 3532 and the calculation result (rotation blur correction amount) of the Roll correction amount calculation unit 3531. A correction rotation center error compensation amount (Xc, Yc) in the X direction and the Y direction for compensating for the center error is calculated. Details of this calculation method will be described in the description of S15 in FIG.

  The target drive position calculation unit 3534 is based on the calculation result (correction rotation center error compensation amount) of the correction rotation center error compensation amount calculation unit 3533 and the calculation result (rotation blur correction amount) of the Roll correction amount calculation unit 3531. A target drive position (X1, X2, Y) of the image sensor drive unit 33 for moving the image sensor 32 in a direction to cancel the image blur is calculated.

  The motor driver 354 corresponds to the calculation result of the target drive position calculation unit 3534 (target drive position of the image sensor drive unit 33), and the X1 drive unit 331, X2 drive unit 332, and Y drive unit 333 of the image sensor drive unit 33. A drive pulse is output to each of these.

FIG. 7 is a diagram illustrating an internal configuration example of the Roll correction amount calculation unit 3531.
As illustrated in FIG. 7, the Roll correction amount calculation unit 3531 includes an integrator 35311.
The integrator 35311 time-integrates the output of the ADC 351, calculates the amount of angular displacement (image plane rotation amount) in the roll direction from the start of shake correction, and outputs it as the amount of rotational shake correction in the roll direction.

  In the camera 1 according to the present embodiment configured as described above, the camera 1 is an example of an imaging device. The optical system 21 is an example of an optical system that forms a subject image. The image sensor 32 is an example of an image sensor that photoelectrically converts a subject image formed by an optical system. The imaging element driving unit 33 is an example of a driving unit that performs translational movement and rotational movement of the imaging element. The Roll angular velocity sensor 36 is an example of a first angular velocity detector that detects a rotational angular velocity with the optical axis direction of the optical system as a rotation axis. The blur correction microcomputer 35 controls the drive unit so that the image blur is corrected based on the rotational angular velocity detected by the first angular velocity detection unit, the optical center position of the optical system, and the rotation center position of the image sensor. It is an example of the image blur correction control part to control.

  In the blur correction microcomputer 35, the Roll correction amount calculation unit 3531 is an example of an image blur correction amount calculation unit that calculates an image blur correction amount based on the rotational angular velocity detected by the first angular velocity detection unit. The corrected rotation center error calculation unit 3532 is an example of a position shift amount calculation unit that calculates a position shift amount between the optical center position of the optical system and the rotation center position of the image sensor. The corrected rotation center error compensation amount calculation unit 3533 is based on the image blur correction amount calculated by the image blur correction amount calculation unit and the position shift amount calculated by the position shift amount calculation unit, in the optical axis direction of the optical system. 2 is an example of a positional deviation compensation amount calculation unit that calculates a positional deviation compensation amount in a first direction that is orthogonal to the first direction and a positional deviation compensation amount in a second direction orthogonal to the first direction. Note that the blur correction microcomputer 35 includes the image blur correction amount calculated by the image blur correction amount calculation unit, the position shift compensation amount in the first direction and the position in the second direction calculated by the position shift compensation amount calculation unit. It is also an example of an image blur correction control unit that controls the drive unit so that the image blur is corrected based on the deviation compensation amount.

Next, an image blur correction operation of the camera 1 according to the present embodiment will be described.
FIG. 8 is a flowchart showing an example of the operation.
This operation is started when the shake correction microcomputer 35 receives the shake correction start instruction signal transmitted from the system controller 34.

  As shown in FIG. 8, when this operation is started, the blur correction microcomputer 35 acquires (receives) the optical center position (Xo, Yo) of the optical system 21 transmitted from the LCU 22 via the system controller 34 ( S11).

  Subsequently, the Roll correction amount calculation unit 3531 detects the amount of angular displacement in the roll direction from the start of blur correction based on the rotational angular velocity in the roll direction detected by the Roll angular velocity sensor 36 (S12) and converted into a digital signal by the ADC 351. Is calculated (S13), and the amount of angular displacement is output as a rotational blur correction amount (θ) in the roll direction (S14).

  Subsequently, the corrected rotation center error calculation unit 3532 calculates a positional shift amount (corrected rotation center error) between the optical center position (Xo, Yo) acquired in S11 and the rotation center position (Xr, Yr) of the image sensor 32. Based on the corrected rotation center error and the rotation blur correction amount (θ) output in S14, the corrected rotation center error compensation amount calculation unit 3533 calculates the corrected rotation center error using the following equation (1). The correction rotation center error compensation amount (Xc, Yc) in the X direction and the Y direction for compensating for is calculated (S15).

  Subsequently, the target drive position calculation unit 3534 is based on the corrected rotational center error compensation amount (Xc, Yc) in the X and Y directions calculated in S15 and the rotational shake correction amount (θ) output in S14. The target drive position (X1, X2, Y) of the image sensor drive unit 33 for moving the image sensor 32 in the direction to cancel the image blur is calculated (S16).

  Subsequently, the motor driver 354, based on the target drive position (X1, X2, Y) of the image sensor drive unit 33 calculated in S16, the X1 drive unit 331, the X2 drive unit 332 of the image sensor drive unit 33, and A drive pulse is output to each of the Y drive units 333 (S17). As a result, the X1 driving unit 331, the X2 driving unit 332, and the Y driving unit 333 are driven to the target driving position, and image blur correction is performed.

  Subsequently, the blur correction microcomputer 35 determines whether or not the image blur correction is completed (whether or not the blur correction end instruction signal is received from the system controller 34) (S18), and processing is performed when the determination result is No. Returns to S11. However, if there is no change in the position of the optical system 21 with respect to the previous processing of S11, the optical center position of the optical system 21 does not change, so the processing may return to S12 instead of S11.

On the other hand, if the determination result in S18 is Yes, this operation ends.
As described above, according to the camera 1 according to the present embodiment, the optical center of the optical system 21 and the rotation center (imaging surface center) of the imaging element 32 are equal to each other due to restrictions (for example, accuracy) in designing and manufacturing the camera 1. Even if it is not done, it is possible to accurately correct the image blur caused by the posture change of the camera 1 in the roll direction.

<Second Embodiment>
The camera 1 according to the second embodiment is a camera having a function of correcting image blur caused by a change in posture of the camera 1 in the yaw direction, the pitch direction, and the roll direction.
FIG. 9 is a diagram illustrating a configuration example of the camera 1 according to the present embodiment.

Note that in the camera 1 according to the present embodiment, the same components as those of the camera 1 according to the first embodiment will be described with the same reference numerals.
As shown in FIG. 9, the camera 1 according to the present embodiment has a configuration in which the interchangeable lens 2 is attached to the camera body 3 in the first embodiment, like the camera 1, and is connected via the contact 4. Communication between the two is possible.

The interchangeable lens 2 includes an optical system 21, an LCU 22, an optical system driving unit 23, a Yaw angular velocity sensor 24a, and a Pitch angular velocity sensor 24b.
The optical system 21 includes a focus lens, a zoom lens, and an image blur correction lens group (hereinafter referred to as “correction lens”) not shown.

  The optical system drive unit 23 moves the focus lens and the zoom lens included in the optical system 21 in the optical axis direction under the control of the LCU 22, and the correction lens included in the optical system 21 is orthogonal to the optical axis direction. Translate in the direction. Thereby, focusing and zooming are performed, and the optical axis direction of the optical system 21 is shifted.

  The LCU 22 communicates with the system controller 34 via the contact 4 and controls the overall operation of the interchangeable lens 2. For example, the LCU 22 controls focusing and zooming by controlling the optical system driving unit 23 in cooperation with the system controller 34. Further, for example, the LCU 22 receives a start / end instruction signal for shake correction transmitted from the system controller 34. For example, the LCU 22 receives the rotation center position (imaging surface center position) of the image sensor 32 and the rotation blur correction amount in the roll direction transmitted from the system controller 34. For example, the LCU 22 cancels image blur based on the rotational center position of the image sensor 32, the rotational blur correction amount in the roll direction, the output of the Yaw angular velocity sensor 24a, and the output of the Pitch angular velocity sensor 24b. The optical system drive unit 23 is controlled to move the correction lens. For example, the LCU 22 monitors the position of the optical system 21 and obtains the optical center position of the optical system 21 from the position of the optical system 21.

  In the camera 1 according to the present embodiment, the optical center of the optical system 21 is shifted by the movement of the correction lens included in the optical system 21, so that the optical center of the optical system 21 and the center of the imaging surface of the image sensor 32 are located. Does not necessarily match. Therefore, the LCU 22 obtains the optical center position from the position of the optical system 21. As a method for obtaining the optical center position at this time, in the same way as the camera 1 according to the first embodiment, for example, the optical center position at each position of the optical system 21 is measured in advance at the design or manufacturing stage. Alternatively, there is a method in which the LCU 22 holds the relationship between the two as an approximate expression or table, and the optical center position is obtained from the position of the optical system 21 based on the approximate expression or table.

In addition, the LCU 22 also performs control of a diaphragm (not shown), for example. Details of the LCU 22 according to the present embodiment will be described later with reference to FIG.
The Yaw angular velocity sensor 24a detects the rotational angular velocity in the yaw direction.

The pitch angular velocity sensor 24b detects a rotational angular velocity in the pitch direction.
In the camera 1 according to the present embodiment, the Yaw angular velocity sensor 24a, the Pitch angular velocity sensor 24b, and the Roll angular velocity sensor 36 are angular velocity sensors having the same configuration, but the mounting direction depends on the detection direction of the rotational angular velocity. Is different.

  As with the camera 1 according to the first embodiment, the camera body 3 includes a shutter 31, an image sensor 32, an image sensor drive unit 33, a system controller 34, a shake correction microcomputer 35, a Roll angular velocity sensor 36, and an SW (switch). Part 37 is included.

Since the shutter 31, the image sensor 32, the Roll angular velocity sensor 36, and the SW unit 37 are the same as those of the camera 1 according to the first embodiment, description thereof is omitted here.
The image sensor drive unit 33 has a configuration that supports the image sensor 32, and rotates the image sensor 32 about the center of the imaging surface of the image sensor 32 as a rotation center under the control of the blur correction microcomputer 35. In this case, for example, the image sensor drive unit 33 may omit the Y drive unit 333 from the one shown in FIG. In this case, the rotational movement range of the image sensor 32 can be expanded by the amount that the Y drive unit 333 is omitted.

  The system controller 34 communicates with the LCU 22 through the contact 4 and communicates with the shake correction microcomputer 35 and controls the overall operation of the camera body 3 and the camera 1. For example, the system controller 34 controls focusing and zooming in cooperation with the LCU 22. For example, the system controller 34 controls the shutter 31 and the image sensor 32. Further, for example, the system controller 34 reads a video signal from the image sensor 32 and converts it into image data of a predetermined format. For example, the system controller 34 receives the rotational center position (imaging surface center position) of the image sensor 32 and the rotational blur correction amount in the roll direction transmitted from the blur correction microcomputer 35, and transmits them to the LCU 22. Further, for example, the system controller 34 transmits a shake correction start / end instruction signal to the shake correction microcomputer 35 and the LCU 22. Further, for example, the system controller 34 receives the instruction signal transmitted from the SW unit 37 and performs processing according to the instruction signal (for example, imaging processing according to the imaging instruction signal).

  The shake correction microcomputer 35 receives the start and end instruction signals for shake correction transmitted from the system controller 34. Further, the blur correction microcomputer 35 controls the image sensor driving unit 33 so as to rotationally move the image sensor 32 in a direction to cancel the image blur based on the output of the Roll angular velocity sensor 36. Further, the blur correction microcomputer 35 transmits the rotation center position of the image sensor 32 and the rotational blur correction amount in the roll direction to the system controller 34.

FIG. 10 is a diagram illustrating an internal configuration example of the shake correction microcomputer 35 according to the present embodiment.
As illustrated in FIG. 10, the shake correction microcomputer 35 includes an ADC 351, a communication unit 352, a correction amount calculation unit 353, and a motor driver 354, similar to the camera 1 according to the first embodiment.

Since the ADC 351 is the same as the camera 1 according to the first embodiment, the description thereof is omitted here.
The communication unit 352 communicates with the system controller 34. For example, the communication unit 352 receives a start / end instruction signal for shake correction transmitted from the system controller 34. For example, the communication unit 352 transmits the rotation center position (imaging surface center position) of the image sensor 32 and the calculation result (rotation blur correction amount) of the Roll correction amount calculation unit 3531 to the system controller 34.

  Based on the output of the ADC 351, the correction amount calculation unit 353 calculates a target drive position (θ) of the image sensor drive unit 33 for rotationally moving the image sensor 32 in a direction to cancel image blur.

More specifically, the correction amount calculation unit 353 includes a Roll correction amount calculation unit 3531 and a target drive position calculation unit 3535, each of which performs the following processing.
Since the Roll correction amount calculation unit 3531 is the same as that of the camera 1 according to the first embodiment, the description thereof is omitted here.

  The target drive position calculation unit 3535 is a target of the image sensor drive unit 33 for rotationally moving the image sensor 32 in a direction to cancel image blur based on the calculation result (rotation blur correction amount) of the Roll correction amount calculation unit 3531. The drive position (θ) is calculated.

The motor driver 354 outputs a drive pulse to the image sensor driving unit 33 in accordance with the calculation result of the target drive position calculating unit 3534 (target drive position of the image sensor driving unit 33).
FIG. 11 is a diagram illustrating an internal configuration example of the LCU 22 according to the present embodiment.

As shown in FIG. 11, the LCU 22 includes an ADC 221a, an ADC 221b, a communication unit 222, a correction amount calculation unit 223, and a motor driver 224.
The ADC 221a sequentially converts an analog signal that is an output signal of the Yaw angular velocity sensor 24a into a digital signal at a predetermined sampling rate, and outputs the digital signal.

The ADC 221b sequentially converts an analog signal that is an output signal of the pitch angular velocity sensor 24b into a digital signal at a predetermined sampling rate, and outputs the digital signal.
The communication unit 222 communicates with the system controller 34. For example, the communication unit 222 receives a start / end instruction signal for shake correction transmitted from the system controller 34. For example, the communication unit 352 receives the rotational center position (imaging surface center position) of the image sensor 32 and the rotational blur correction amount in the roll direction transmitted from the system controller 34.

  Based on the output of the ADC 221a, the output of the ADC 221b, the rotation center position (imaging surface center position) of the image sensor 32 and the rotation blur correction amount in the roll direction received by the communication unit 222, the correction amount calculation unit 223 The target drive position (Xt, Yt) of the optical system drive unit 23 for moving the correction lens in the direction to cancel the blur is calculated.

  More specifically, the correction amount calculation unit 223 includes a Yaw displacement amount calculation unit 2231a, a Pitch displacement amount calculation unit 2231b, a Yaw / Pitch correction amount calculation unit 2232, a corrected rotation center error calculation unit 2233, and a correction rotation center error compensation amount calculation unit. 2234, the target position calculation part 2235, and the target position conversion part 2236, and each part performs the following processes.

The Yaw displacement amount calculation unit 2231a calculates the angular displacement amount in the yaw direction from the start of blur correction based on the output of the ADC 221a.
The pitch displacement amount calculation unit 2231b calculates an angular displacement amount in the pitch direction from the start of blur correction based on the output of the ADC 221b.

  The Yaw / Pitch correction amount calculation unit 2232 moves the image plane in the X direction from the start of blur correction based on the calculation result (the angular displacement amount in the yaw direction) of the Yaw displacement amount calculation unit 2231a and the focal length of the optical system 21. The amount is calculated and output as a blur correction amount in the X direction. In addition, the Yaw / Pitch correction amount calculation unit 2232, together with that, based on the calculation result (angle displacement amount in the pitch direction) of the pitch displacement amount calculation unit 2231b and the focal length of the optical system 21, the Y from the start of blur correction. The amount of image plane movement in the direction is calculated and output as the amount of blur correction in the Y direction.

Details of the Yaw displacement amount calculation unit 2231a, the Pitch displacement amount calculation unit 2231b, and the Yaw / Pitch correction amount calculation unit 2232 will be described later with reference to FIG.
The correction rotation center error calculation unit 2233 moves the rotation center position of the image sensor 32 received by the communication unit 352 by the shake correction amount in the X direction and the Y direction calculated by the Yaw / Pitch correction amount calculation unit 2232. The positional deviation amount (corrected rotation center error) between the measured position and the optical center position of the optical system 21 is calculated.

  The correction rotation center error compensation amount calculation unit 2234 is based on the calculation result (correction rotation center error) of the correction rotation center error calculation unit 2233 and the rotation blur correction amount in the roll direction received by the communication unit 352. A correction rotation center error compensation amount (Xc, Yc) in the X direction and the Y direction for compensating the error is calculated. The details of this calculation method will be described in the description of S35 in FIG.

  The target position calculation unit 2235 calculates the calculation result of the Yaw / Pitch correction amount calculation unit 2232 (blur correction amount in the X direction and Y direction) and the calculation result of the correction rotation center error compensation amount calculation unit 2234 (correction in the X direction and Y direction). And the target position (Xa, Ya) of the correction lens for moving the correction lens in the direction to cancel the image blur is calculated. Details of this calculation method will be described in the description of S36 of FIG.

The target position conversion unit 2236 converts the calculation result (target position of the correction lens) of the target position calculation unit 2235 into the target drive position (Xt, Yt) of the optical system drive unit 23.
The motor driver 224 outputs a drive pulse to the optical system drive unit 23 according to the calculation result of the target position conversion unit 2236 (target drive position of the optical system drive unit 23).

FIG. 12 is a diagram illustrating a configuration example of the Yaw displacement amount calculation unit 2231a, the Pitch displacement amount calculation unit 2231b, and the Yaw / Pitch correction amount calculation unit 2232.
As shown in FIG. 12, the Yaw displacement amount calculation unit 2231a, the Pitch displacement amount calculation unit 2231b, and the Yaw / Pitch correction amount calculation unit 2232 include an integrator 22311a, an integrator 22311b, a multiplier 22321a, and a multiplier 22321b. Including. The integrator 22231a is included in the Yaw displacement amount calculation unit 2231a, the integrator 22311b is included in the Pitch displacement amount calculation unit 2231b, and the multipliers 22321a and 22321b are included in the Yaw / Pitch correction amount calculation unit 2232. .

The integrator 22311a time-integrates the output of the ADC 221a and calculates the angular displacement amount in the yaw direction from the start of blur correction.
The multiplier 22321a multiplies the calculation result of the integrator 22311a (the angular displacement amount in the yaw direction from the start of blur correction) and the focal length of the optical system 21, and calculates the image plane movement amount in the X direction from the start of blur correction. This is calculated and output as a blur correction amount in the X direction.

The integrator 22311b time-integrates the output of the ADC 221b and calculates the amount of angular displacement in the pitch direction from the start of blur correction.
The multiplier 22321b multiplies the calculation result of the integrator 22311b (the angular displacement amount in the pitch direction from the start of blur correction) and the focal length of the optical system 21, and calculates the image plane movement amount in the Y direction from the start of the blur correction. This is calculated and output as a blur correction amount in the Y direction.

  In the camera 1 according to the present embodiment configured as described above, the camera 1 is an example of an imaging device. The optical system 21 is an example of an optical system that forms a subject image. The image sensor 32 is an example of an image sensor that photoelectrically converts a subject image formed by an optical system. The optical system driving unit 23 and the imaging element driving unit 33 are an example of a driving unit that performs translational movement of an image blur correction lens included in the optical system and rotational movement of the imaging element. The Roll angular velocity sensor 36 is an example of a first angular velocity detector that detects a rotational angular velocity with the optical axis direction of the optical system as a rotation axis. The LCU 22 and the blur correction microcomputer 35 are driven so that the image blur is corrected based on the rotation angular velocity detected by the first angular velocity detection unit, the optical center position of the optical system, and the rotation center position of the image sensor. 3 is an example of an image blur correction control unit that controls the unit.

  The Yaw angular velocity sensor 24a is an example of a second angular velocity detector that detects a rotational angular velocity with a first direction orthogonal to the optical axis direction of the optical system as a rotation axis. The Pitch angular velocity sensor 24b is an example of a third angular velocity detector that detects a rotational angular velocity having a second direction orthogonal to the first direction as a rotation axis. The Roll correction amount calculation unit 3531 is an example of a first image blur correction amount calculation unit that calculates a first image blur correction amount based on the rotational angular velocity detected by the first angular velocity detection unit. The Yaw displacement amount calculation unit 2231a, the Pitch displacement amount calculation unit 2231b, and the Yaw / Pitch correction amount calculation unit 2232 are based on the rotation angular velocity detected by the second angular velocity detection unit and the focal length of the optical system. An image blur correction amount calculating unit that calculates an image blur correction amount and calculates a third image blur correction amount based on the rotational angular velocity detected by the third angular velocity detection unit and the focal length of the optical system. It is an example. The correction rotation center error calculation unit 2233 moves the rotation center position of the image sensor by the amount of the second image blur correction amount and the third image blur correction amount calculated by the second image blur correction amount calculation unit. 2 is an example of a positional deviation amount calculation unit that calculates a positional deviation amount between the position and the optical center position of the optical system. The corrected rotation center error compensation amount calculation unit 2234 is based on the first image blur correction amount calculated by the first image blur correction amount calculation unit and the position shift amount calculated by the position shift amount calculation unit. It is an example of a position shift compensation amount calculation unit that calculates a position shift compensation amount in a first direction and a position shift compensation amount in a second direction. Note that the LCU 22 and the blur correction microcomputer 35 include the first image blur correction amount calculated by the first image blur correction amount calculation unit and the second image blur correction amount calculated by the second image blur correction amount calculation unit. Image blur is corrected based on the correction amount and the third image blur correction amount, and the position shift compensation amount in the first direction and the position shift compensation amount in the second direction calculated by the position shift compensation amount calculation unit. It is also an example of an image blur correction control unit that controls the drive unit.

Next, an image blur correction operation of the camera 1 according to the present embodiment will be described.
FIG. 13 is a flowchart showing an example of the operation.
This operation is started when the shake correction microcomputer 35 and the LCU 22 receive the shake correction start instruction signal transmitted from the system controller 34. In FIG. 13, the left side shows the control operation of the blur correction microcomputer 35, and the right side shows the control operation of the LCU 22.

  As shown in FIG. 13, when this operation is started, the blur correction microcomputer 35 detects the roll angular velocity sensor 36 (S21), and performs roll correction based on the rotational angular velocity in the roll direction converted into a digital signal by the ADC 351. The amount calculation unit 3531 calculates an angular displacement amount in the roll direction from the start of blur correction (S22), and outputs the angular displacement amount as a rotational blur correction amount (θ) in the roll direction (S23).

  Subsequently, the blur correction microcomputer 35 transmits the rotational blur correction amount (θ) in the roll direction and the rotation center position (imaging surface center position) (Xr, Yr) of the image sensor 32 to the LCU 22 via the system controller 34. (S24).

  Subsequently, the target drive position calculation unit 3535 uses the target of the image sensor drive unit 33 to rotationally move the image sensor 32 in a direction to cancel image blur based on the rotational blur correction amount (θ) output in S23. The drive position (θ) is calculated (S25).

  Subsequently, the motor driver 354 outputs a drive pulse to the image sensor drive unit 33 according to the target drive position (θ) of the image sensor drive unit 33 calculated in S25 (S26). Thereby, the image sensor drive unit 33 is driven to the target drive position, and rotational blur correction is performed.

  Subsequently, the blur correction microcomputer 35 determines whether or not the image blur correction is completed (whether or not the blur correction end instruction signal is received from the system controller 34) (S27). If the determination result is No, the process is performed. Returns to S21, and when the determination result is Yes, the control operation of the blur correction microcomputer 35 is completed.

  On the other hand, in the LCU 22, the optical center position (Xo, Yo) of the optical system 21, the rotational shake correction amount (θ) in the roll direction transmitted from the shake correction microcomputer 35 via the system controller 34 in S 24, and the image sensor 32. The rotation center position (Xr, Yr) is acquired (S31).

  Subsequently, based on the rotational angular velocities in the yaw and pitch directions detected by the Yaw angular velocity sensor 24a and the Pitch angular velocity sensor 24b (S32) and converted into digital signals by the ADC 221a and ADC 221b, the Yaw displacement amount calculation unit 2231a and the Pitch displacement are calculated. The amount calculation unit 2231b calculates the amount of angular displacement in the yaw direction and pitch direction from the start of blur correction (S33).

  Subsequently, the Yaw / Pitch correction amount calculation unit 2232 calculates the image plane movement amount in the X direction from the start of the blur correction based on the angular displacement amount in the yaw direction calculated in S33 and the focal length of the optical system 21 as X. The amount of image plane movement in the Y direction from the start of blur correction is calculated based on the angular displacement amount in the pitch direction and the focal length of the optical system 21 calculated in S33. This is calculated as the direction blur correction amount (Y) (S34).

  Subsequently, the corrected rotation center error calculation unit 2233 uses the rotation center position (Xr, Yr) of the image sensor 32 acquired in S31 as the blur correction amount (X, Y) in the X direction and the Y direction calculated in S34. The amount of positional deviation (corrected rotation center error) between the position moved by this amount and the optical center position (Xo, Yo) of the optical system 21 is calculated, and the corrected rotation center error compensation amount calculation unit 2234 calculates the corrected rotation. Based on the center error and the rotational shake correction amount (θ) acquired in S31, the following equation (2) is used to compensate for the corrected rotation center error in the X direction and the Y direction to compensate for the corrected rotation center error. The amount (Xc, Yc) is calculated (S35).

  Subsequently, the target position calculation unit 2235 uses the following equation (3) to calculate the blur correction amount (X, Y) in the X direction and the Y direction calculated in S34 and the X direction and the Y direction calculated in S35. The correction rotation center error compensation amount (Xc, Yc) is added to calculate the target position (Xa, Ya) of the correction lens for moving the correction lens in the direction to cancel the image blur, and the target position conversion unit 2236 The target position (Xa, Ya) of the correction lens is converted to the target drive position (Xt, Yt) of the optical system drive unit 23 (S36).

  Subsequently, the motor driver 224 outputs a drive pulse to the optical system drive unit 23 according to the target drive position (Xt, Yt) of the optical system drive unit 23 converted in S36 (S37). As a result, the optical system drive unit 23 is driven to the target drive position, and the angle shake correction in the Yaw / Pitch direction and the image shake correction due to the correction rotation center error in the X direction and the Y direction due to the rotation shake in the Roll direction are performed. Done.

  Subsequently, the LCU 22 determines whether or not image blur correction has ended (whether or not a blur correction end instruction signal has been received from the system controller 34) (S38). If the determination result is No, the process proceeds to S31. Returning, if the determination result is Yes, the control operation of the LCU 22 ends.

  As described above, according to the camera 1 according to the present embodiment, the optical center of the optical system 21 is shifted by the movement of the correction lens included in the optical system 21 so that the optical center of the optical system 21 and the center of the imaging surface of the imaging element 32 are located. Even if they do not match, not only the image blur caused by the posture change of the camera 1 in the yaw direction and the pitch direction but also the image blur caused by the posture change of the camera 1 in the roll direction is corrected accurately. can do.

  In addition, since the camera 1 according to the present embodiment only needs to include a drive mechanism that rotates and moves the image sensor 32 as the drive mechanism of the image sensor 32, it is necessary to include a drive mechanism that translates the image sensor 32. Accordingly, the rotational movement range of the image sensor 32 can be expanded.

The camera 1 according to the first and second embodiments has been described above, but the camera 1 according to each embodiment can be variously modified.
For example, in the camera 1 according to the first embodiment, one lens group included in the optical system 21 may serve as both a focus lens and a zoom lens.

  For example, in the camera 1 according to the second embodiment, one lens group included in the optical system 21 may play two or more roles of a focus lens, a zoom lens, and a correction lens.

  In the camera 1 according to each of the first and second embodiments, the optical system 21 may not include a zoom lens. In this case, movement of the zoom lens by the optical system driving unit 23 is not necessary, and zooming control by the LCU 22 performed in cooperation with the system controller 34 is also unnecessary.

  In the camera 1 according to each of the first and second embodiments, the interchangeable lens 2 may be configured to perform focusing and zooming manually. In this case, it is not necessary to move the focus lens and the zoom lens by the optical system driving unit 23, and it is not necessary to control focusing and zooming by the LCU 22 in cooperation with the system controller 34.

  Further, in the camera 1 according to each of the first and second embodiments, when the optical center of the optical system 21 is shifted by the operation of the diaphragm (not shown), the operation of the diaphragm, the position of the optical system 21, and the optical system The LCU 22 is configured to hold the relationship with the optical center position of 21 as an approximate expression or table, and the optical center position is obtained from the operation of the diaphragm and the position of the optical system 21 based on the approximate expression or table. Also good.

  Further, in the camera 1 according to the first embodiment, the camera body 3 further includes a Yaw angular velocity sensor and a Pitch angular velocity sensor, and the image sensor driving unit 33 also detects image blur due to the posture change of the camera 1 in the yaw direction and the pitch direction. The blur correction microcomputer 35 may be configured to correct by the drive control.

  As mentioned above, the embodiment described above shows a specific example of the present invention in order to facilitate understanding of the invention, and the present invention is not limited to the above-described embodiment. The present invention can be variously modified and changed without departing from the concept of the present invention defined in the claims.

1 Camera 2 Interchangeable Lens 3 Camera Body 4 Contact 21 Optical System 22 LCU
23 Optical system drive unit 24a Yaw angular velocity sensor 24b Pitch angular velocity sensor 31 Shutter 32 Image sensor 33 Image sensor drive unit 34 System controller 35 Blur correction microcomputer 36 Roll angular velocity sensor 37 SW unit 221a, 221b ADC
222 Communication unit 223 Correction amount calculation unit 224 Motor driver 331 X1 drive unit 332 X2 drive unit 333 Y drive unit 351 ADC
352 Communication unit 353 Correction amount calculation unit 354 Motor driver 2231a Yaw displacement amount calculation unit 2231b Pitch displacement amount calculation unit 2232 Yaw / Pitch correction amount calculation unit 2233 Correction rotation center error calculation unit 2234 Correction rotation center error compensation amount calculation unit 2235 Target position Calculation unit 2236 Target position conversion unit 3531 Roll correction amount calculation unit 3532 Correction rotation center error calculation unit 3533 Correction rotation center error compensation amount calculation unit 3534 Target drive position calculation unit 3535 Target drive position calculation units 22311a and 22311b Integrators 22321a and 22321b Multiplication 35311 integrator

Claims (6)

An optical system for forming a subject image;
An image sensor that photoelectrically converts a subject image formed by the optical system;
A drive unit that performs translational movement and rotational movement of the imaging element, or translational movement of an image blur correction lens included in the optical system and rotational movement of the imaging element;
A first angular velocity detector that detects a rotational angular velocity with the optical axis direction of the optical system as a rotation axis;
Based on the rotation angular velocity detected by the first angular velocity detection unit, the optical center position of the optical system, and the rotation center position of the image sensor, the drive unit is controlled so that image blur is corrected. An image blur correction control unit;
An imaging apparatus comprising: The image blur correction control unit
An image blur correction amount calculator that calculates an image blur correction amount based on the rotational angular velocity detected by the first angular velocity detector;
A positional deviation amount calculation unit for calculating an amount of positional deviation between the optical center position of the optical system and the rotation center position of the imaging element;
Based on the image blur correction amount calculated by the image blur correction amount calculation unit and the position shift amount calculated by the position shift amount calculation unit, a first orthogonal to the optical axis direction of the optical system. A positional deviation compensation amount calculating unit that calculates a positional deviation compensation amount in a direction and a positional deviation compensation amount in a second direction orthogonal to the first direction;
Including
The image blur correction control unit includes the image blur correction amount calculated by the image blur correction amount calculation unit, the position shift compensation amount in the first direction calculated by the position shift compensation amount calculation unit, and the second Controlling the drive unit so that image blur is corrected based on a positional deviation compensation amount in the direction of
The imaging apparatus according to claim 1. A second angular velocity detection unit that detects a rotational angular velocity having a first direction orthogonal to the optical axis direction of the optical system as a rotation axis;
A third angular velocity detector that detects a rotational angular velocity with a second direction orthogonal to the first direction as a rotation axis;
Further comprising
The image blur correction control unit
A first image blur correction amount calculation unit that calculates a first image blur correction amount based on the rotational angular velocity detected by the first angular velocity detection unit;
A second image blur correction amount is calculated based on the rotational angular velocity detected by the second angular velocity detector and the focal length of the optical system, and the rotational angular velocity detected by the third angular velocity detector and the A second image blur correction amount calculating unit that calculates a third image blur correction amount based on the focal length of the optical system;
A position where the rotation center position of the image sensor is moved by the amount of the second image blur correction amount and the third image blur correction amount calculated by the second image blur correction amount calculating unit; A positional deviation amount calculating unit for calculating a positional deviation amount from the optical center position of the optical system;
Position shift compensation in the first direction based on the first image blur correction amount calculated by the first image blur correction amount calculation unit and the position shift amount calculated by the position shift amount calculation unit. A positional deviation compensation amount calculating unit that calculates an amount and a positional deviation compensation amount in the second direction;
Including
The image blur correction control unit includes a first image blur correction amount calculated by the first image blur correction amount calculation unit and a second image calculated by the second image blur correction amount calculation unit. Based on the blur correction amount and the third image blur correction amount, and the position shift compensation amount in the first direction and the position shift compensation amount in the second direction calculated by the position shift compensation amount calculation unit. , Controlling the drive unit so that image blur is corrected,
The imaging apparatus according to claim 1. An optical system that forms a subject image, an image sensor that photoelectrically converts the subject image formed by the optical system, and translational movement and rotational movement of the image sensor, or image blur correction included in the optical system An image blur of an imaging apparatus, comprising: a drive unit that performs translational movement of the lens and rotational movement of the imaging device; and a first angular velocity detection unit that detects a rotational angular velocity with the optical axis direction of the optical system as a rotation axis. A correction method,
Based on the rotation angular velocity detected by the first angular velocity detection unit, the optical center position of the optical system, and the rotation center position of the image sensor, the drive unit is controlled so that image blur is corrected. ,
An image blur correction method characterized by the above. The image blur correction method includes:
An image blur correction amount is calculated based on the rotational angular velocity detected by the first angular velocity detection unit,
Calculating a positional deviation amount between the optical center position of the optical system and the rotation center position of the image sensor;
Based on the calculated image blur correction amount and the calculated positional deviation amount, the positional deviation compensation amount in the first direction orthogonal to the optical axis direction of the optical system and the first direction Calculating a positional deviation compensation amount in the second direction orthogonal to each other;
Based on the calculated image blur correction amount and the calculated position shift compensation amount in the first direction and the position shift compensation amount in the second direction, the driving unit is configured to correct image blur. Control,
The image blur correction method according to claim 4. The imaging apparatus includes a second angular velocity detector that detects a rotational angular velocity having a first direction orthogonal to the optical axis direction of the optical system as a rotation axis, and a second orthogonal to the first direction. A third angular velocity detection unit that detects a rotational angular velocity with the direction of 2 as a rotation axis;
The image blur correction method includes:
Calculating a first image blur correction amount based on the rotational angular velocity detected by the first angular velocity detector;
A second image blur correction amount is calculated based on the rotational angular velocity detected by the second angular velocity detector and the focal length of the optical system, and the rotational angular velocity detected by the third angular velocity detector and the A third image blur correction amount is calculated based on the focal length of the optical system, and the rotation center position of the image sensor is determined by dividing the calculated second image blur correction amount and the third image blur correction amount. Calculating a positional deviation amount between the position moved only by the optical center position of the optical system,
Based on the calculated first image blur correction amount and the calculated positional deviation amount, a positional deviation compensation amount in the first direction and a positional deviation compensation amount in the second direction are calculated,
The calculated first image blur correction amount, the calculated second image blur correction amount and the third image blur correction amount, the calculated positional deviation compensation amount in the first direction, and the first Controlling the drive unit so that image blur is corrected based on the positional deviation compensation amount in the direction of 2.
The image blur correction method according to claim 4.